Hammer crusher with adjustable resilient feed grate



Aug. 29, 1939. 1 TscHAuNr-:R

HAMM-ER CRUSHER WITH ADJUSTABLE RESILIENT FEED GRATE Filed May 25, 1938 Lea Tsckauher IN'VE NT-Qf @A1 @SMWL Patented Aug. 29, 1939 UNITED STATES HAMLIER CRUSHER WITH ADJUSTABLE RESILIENT FEED GRATE A Leo Tschauner, Brunn, Moravia, Czechoslovakia,

assignor to the rm of The Skodaworks formerly Czechoslovakia ted Company Plien, Prague,

Application May 25, 1938, Serial No. 209,881 In Czechoslovakia December 6, 1935 2Claims.

The present invention has for its object a hammer-Crusher having a feed grate permitting of an adjustment of the depth of the blow of the hammers on the material to be crushed, the indi- 5 vidual ribs of said grate yielding elastically when being attacked by forces directed radially outwardly from the drive shaft and exceeding a determined admissible maximum value.

According to a feature of the present invention the feed grate consists of individual suitably formed ribs with one extremity supported pivotally by the Crusher housing, whilst the other extremity of the grate ribs is adapted to yield resiliently when struck by particles from within the housing.

The accompanying drawing shows, by way of example, in Figs. 1-5 two embodiments of the present invention. Fig. 1 is a vertical section and Fig. 2 a plan view of one design, Fig. 3 is a vertical section and Fig. 4 a plan view of the second design. Fig. 5 shows a detail of the design shown in Figs. 1 and 2.

In the drawing, I indicates the driven rotor shaft with drive arms 2 arranged thereon, at

the ends of which arms the crushing hammers 3 are journalled in a well known manner. 'I'he feed grate is formed by ribs 5 arranged pivotally about journals 6 through journal bearings I on the crusher housing. The ribs 5 are, at the other end, generally angularly bent and limited at the outside by a circular arch in the centre of which the journal 6 is arranged, the free ends of the ribs 5 being slidable in corresponding grooves of a guideplate 8. Therefore the ribs 5 are adapted to move into different height positions by pivoting about the journal 6.

The most convenient position in height, in the device of Fig. 1, is determined by a thrust-pan I2 adapted to be adj-usted by means of screws II.

Through the action of tension screws 9, the profjections I3, provided on the' ribs 5, are pressed against the thrust-pan I2 through the action of pressure springs I0, whereby the -stroke of the hammers in the feed grate may be altered. Such stroke can also be changed on the running machine by means of the screws II (Fig. 5), thus compensating for the wear and tear of the hammers.

In the second embodiment, shown in Figure 3,

the free extremity of the ribs 5 is also guided in grooves of a suitably formed guideplate 8, but is supported in a fork-like lug I5, mounted on the end of a screw I-4 which is urged into its lowest position by the thrust spring I6. In this case too,

the wear and tear of the hammers may be compensated at any time by suitable readjustment of the grate.

In both embodiments, the ribs 5 when being exposed to blows acting in a radial outward direction and exceeding a maximum admissible 5 value are adapted to yield resiliently thus avoiding jamming of the devices and possible fractures of the parts thereof.

What I claim is:

1. A hammer crusher, comprising a housing, a rotor in said housing, crushing hammers carried by said rotor, a. basket-shaped feed grate disposed above said rotor, said feed grate having a plurality of independently movable bars extending in planes at right angles to the rotor axis and intersecting the periphery of the hammer path, each of said bars being bent to form an angle between and 90 and having one end thereof pivoted to one side of said housing, the other end being adapted to move towards and away from the rotor axis along the opposite side of the housing, guide tracks on said opposite side of the housing of a shape and length to guide the movable ends of said bars ovex` the entire length of their movement, abutment means to deiine the innermost positions tovwhich said bars may be tilted, means to adjust said abutment means to different positions to vary the blow stroke of the hammers onto the grate, and independent resilient means associated with each of said bars to retain the same in the adjusted innermost position, whereby each of said bars may yield to blows from within the housing exceeding a predetermined maximum independently from the other bars.

2. A hammer crusher, comprising a housing, a rotor in said housing, crushing hammers carried by said rotor, a basket-shaped feed grate disposed above said rotor, said feed grate having a plurality of independently movable curved bars extending in planes at right angles to the rotor axis and intersecting the periphery of the hammer path, each of said bars having one end thereof pivoted to one side of said housing, the other end being adapted to move towards and away from the rotor axis along the opposite side of the housing, guide tracks on said opposite side of the housingof a. shape and length to guide the movable ends of said bars over the entire length of their movements, the lower sides of said bars adjacent the pivoted ends thereof being provided with abutment faces, a thrust plate disposed adjacent that side of the housing to which the bars are pivoted below and parallel to the pivot axis and extending throughout the width of the hous- 55 aligned holes in ma thrust pme and the wan of said housing.v a nut screwed onto the outermost end of each tension bolt, and a helical pressure spring surrounding each bolt between the outer wail of the housin and the corresponding nut. 5

LEO TSCHAUNER. 

